The filing says that the agreement, reached in the second quarter, includes the provision of airplane parts, manuals, navigation charts and data to the airline, in line with the US company's recommendations to customers for such things as an aircraft modification, a parts replacement or inspection.

Boeing also reported it had discussions with the flag carrier's subsidiary, Iran Air Tours, on the potential sale of similar goods and services.

In April, the US government issued a license allowing Boeing, for a "limited period of time," to provide "spare parts that are for safety purposes" to Iran. Boeing is still not allowed to sell new planes to Iran.

The license was granted by the US Treasury Department in the context of an interim deal between world powers and Iran over its nuclear program signed in November.

In late February, another US company, General Electric, indicated it had requested permission to sell spare airliner parts to Iran.

Washington severed diplomatic relations with Iran in the aftermath of the 1979 Islamic revolution.